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Full Discussion: Bash - proper way to append variable to stderr
Top Forums Shell Programming and Scripting Bash - proper way to append variable to stderr Post 303003572 by alex2005 on Saturday 16th of September 2017 06:32:58 AM
Old 09-16-2017
Bash - proper way to append variable to stderr
Hello,

Can you please if the bellow is the proper way of appending a variable to the stderr:

The easiest way to test this,I was able to imagine, was by touching 5 files and afterwards looping trough to the results:
Code:
-rw-r--r--  1 ab  owner  0 Sep 14 13:45 file1
-rw-r--r--  1 ab  owner  0 Sep 14 13:45 file3
-rw-r--r--  1 ab  owner  0 Sep 14 13:45 file5
-rw-r--r--  1 ab  owner  0 Sep 14 13:45 file6
-rw-r--r--  1 ab  owner  0 Sep 14 13:45 file8

In order to get the missing files logs i run:
Code:
for i in {1..8} ; do ls -al file$i 2>> error.log ; done

But if I want to append a variable let's say the date, I was able to came with:
Code:
for i in {1..8} ; do ls -al file$i 2> >( while read line; do echo "$(date): ${line}"; done >> error.log ) ; done

The question I have if this the best way to append a variable to stderr?
Last edited by MadeInGermany; 09-16-2017 at 04:16 PM.. Reason: Changed icode tags to code tags
 

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LEARN ABOUT CENTOS

pmdatrivial

PMDATRIVIAL(1)						      General Commands Manual						    PMDATRIVIAL(1)

NAME

       pmdatrivial - trivial performance metrics domain agent (PMDA)

SYNOPSIS

       $PCP_PMDAS_DIR/trivial/pmdatrivial [-d domain] [-l logfile] [-U username]

DESCRIPTION

       pmdatrivial is the simplest possible Performance Metrics Domain Agent (PMDA) which exports a single performance metric, the time in seconds
       since the 1st of January, 1970.

       The trivial PMDA is shipped as source code and is designed to be an aid for PMDA developers.

       A brief description of the pmdatrivial command line options follows:

       -d   It is absolutely crucial that the performance metrics domain number specified here is unique and consistent.  That is,  domain  should
	    be different for every PMDA on the one host, and the same domain number should be used for the same PMDA on all hosts.

       -l   Location of the log file.  By default, a log file named trivial.log is written in the current directory of pmcd(1) when pmdatrivial is
	    started, i.e.  $PCP_LOG_DIR/pmcd.  If the log file cannot be created or is not writable, output  is  written  to  the  standard  error
	    instead.

       -U   User  account  under  which  to run the agent.  The default is the unprivileged "pcp" account in current versions of PCP, but in older
	    versions the superuser account ("root") was used by default.

INSTALLATION

       If you want access to the names, help text and values for the trivial performance metrics, do the following as root:

	    # cd $PCP_PMDAS_DIR/trivial
	    # ./Install

       If you want to undo the installation, do the following as root:

	    # cd $PCP_PMDAS_DIR/trivial
	    # ./Remove

       pmdatrivial is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent	is
       installed or removed.

FILES

       $PCP_PMCDCONF_PATH
		 command line options used to launch pmdatrivial
       $PCP_PMDAS_DIR/trivial/help
		 default help text file for the trivial metrics
       $PCP_PMDAS_DIR/trivial/Install
		 installation script for the pmdatrivial agent
       $PCP_PMDAS_DIR/trivial/Remove
		 undo installation script for the pmdatrivial agent
       $PCP_LOG_DIR/pmcd/trivial.log
		 default log file for error messages and other information from pmdatrivial

PCP ENVIRONMENT

       Environment  variables  with  the prefix PCP_ are used to parameterize the file and directory names used by PCP.  On each installation, the
       file /etc/pcp.conf contains the local values for these variables.  The $PCP_CONF variable may be used to specify an alternative	configura-
       tion file, as described in pcp.conf(5).

SEE ALSO

       PCPIntro(1), pmcd(1), pmdasample(1), pmdasimple(1), pmdatxmon(1) and PMDA(3).

Performance Co-Pilot							PCP							    PMDATRIVIAL(1)
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